Fluid-controlled boring machine



- Feb. 17,1959 A. FRAUTSCHI ETAL 2, 3,

FLUID CONTROLLED BORING MACHINE Filed May 3, 1955 s Sheets-Sheet 1 1959 v A. FRAUTSCHI ETAL I 2,87

FLUID-CONTROLLED BORING MACHINE Filed May 3, 1955 3 Sheets-Sheet 2 FIG. 2

A. FRAUTSCHI ETAL FLUID-CONTROLLED BORING MACHINE Feb. 17, 1959 3 Sheets-Sheet 5 Filed May 3, 1955 FLUID CONTROLLED BORING MACHINE Andr Frautschi and Louis Monney, Bienne, Switzerland Application May 3, 1955, Serial No; 505,593 Claims priority, application Switzerland May 8, 1954 4 Claims. (Cl. 7732.2)

Our invention has: forits object a fluid-controlled boring machine.

According to our invention; themovements of a feeler are adapted to control the admission of fluid into a pilot cylinder, the piston in which controls the longitudinal movements of the drill. Said feeleris adapted to engage atemplate carried by a horizontally shiftable platform to which the work to be machined is also'secured. Various objects of my invention will appear in reading the following disclosure.

Accompanying drawings illustrate by way of example a preferredembodiment of the machine according to the invention;

In said. drawings:

Fig. 1 is an elevational view of the machine.

Fig. 2 is a side view partly sectional of the same machine.

Fig. 3 is a cross-sectional View ofa detail through line III-III of Fig. 2.

Fig, 4 is a sectional view of a detail through line IV-IV of Fig. 1. a

Fig. 5 is a wiring diagram of the machine.

The boring machine illustrated includes a frame 1 carrying through the agency of balls 2 a table 3 adapted to move freely in any desired horizontal direction. Said table is adapted to carry at one end the work 4 to be bored and at the other end a template 5 provided with atleast one opening 6 corresponding to the perforation to be executed in the work 4. Further means which are not illustrated are provided for defining accurately the relative position of the template 5 with reference to the work 4. The machine includes a quill or sleeve 7 (Fig. 2) carrying inside it and coaxially therewith a spindle 8 carrying the actual boring tool atits lower end. The axial movements of said quill '7 are controlled by a lever 9 pivotally secured at 10 to the quill: said quill is furthermore pivotally secured through a link 11 to a sleeve 12 adapted to be shifted axiallyby means of a micrometric screw 13 provided for adjusting purposes. The lever 9is controlled in its turn by a tubular member 14 to which it is pivotally connected through the agency of an intermediate link 15. Said tubular member 14carries a piston 16 moving inside a pilot cylinder 17 under the action of compressed air entering the cylinder selectively on one of the sides of the piston 16 through the pipes 18 and 19 respectively. The admission of compressed air is controlled by conventional valves which are not illustrated and which are controlled in their turn through electric means as described hereinafter.

i United States Patent 0 The machine illustrated includes furthermore a feeler 20 adapted to move axially inside a section In. of the feeler rod 20 are produced by a lever 21 controlled by hand and pivotally securedat 22 to the feeler rod 20, while it. is also pivotally secured through the agency of a link 23 to a member 24 sliding inside. the above mentioned section In of" the frame 1; said member 24 is held in the position. illustrated'in Fig. 4'by a return spring 25. By exerting a thrust in the direction of the arrow 26 on the lever. 21, the operator produces a downward shiftingof the rod 20. Whenthe operator feels that the tip 20a has engaged the perforation or opening 6 in the template, he should exerta moreconsiderable pressure on the lever 21 so as to shift upwardly the member 24 against the action of its returnsp'ring 25. As itrises, the niember24 releasesatswitch 27 which closes; asit'closes, the switch27 providesfor the feeding of a relay 28 .(Fig. 5), the contactpiece 29ofwhich controls selectively through the windings .30 and 31*the abovementioned valves distributing compressed air into the pilot cylinder 17. Energizationof therelay sends compressed air into the upper partxof the cylinder'17so as to make the piston 16 and the tubular-member 14 sink. The quill 7 is thus also shifted downwardly; a

second contact piece 32 controlled by the relay 28 provides for the self-energization of the latter, even after theswitch 27 has been allowed to open again.

It shouldbe remarkedthat the tip*20rl of" the feeler rod 20isconical and consequently, when it'engages the opening 6 in the template 5, thefeeler finishes centering the latter, since the table 3 is adapted to move freely in a horizontal plane. The feelerrod'2tlcarries a piston 33 moving inside a cylindrical chamber 34formed in the section in ofthe frame 1." Compressed air is sent through a channel 35 into said chamber 34 above the piston 33 so as to hold through action on last mentioned piston the tip 29a of the feelerrod in engagementwith the template 5.

The downwardrnovement ofthetubular member 14 is firstproduced at high speedand then after thehead 3600f the rod 36 rigid with the tubular member 14 compresses a coil spring 37 housed insidea socket formed by a plug 38 secured to a sleeve 39. Thelatter is now shifted downwardly together with the; tubular member 14; said sleeve is provided with aflange' shaped part 39a forming a piston moving in'a chamber 40formed inside the support 41 carrying thepilot cylinder .17. Said chamber is filled with oil which ,is driven outwardly when the piston 39 sinks so that said oil passes into a channel 22 the cross sectional area ofwhich is adjusted by a needle valve 43. The downward move.- ment of the tubular member 16 is thus braked so as to produce a slow progression of the quill as required for the actual boring operation. During the upward return movement of the tubularmember 14, the oil which has entered an auxiliary chamber reenters freely the chamber 4% through a channel 44 provided with a non-return valve 45. p i

When it is desired to execute deep bores, an arrangement operates soas to make the quillreciprocateand to thus furtherthe removal of the shavings. To this end, the plug 38 is provided with a switch 46; furthermore a coil spring 47 acts on the auxiliary piston39a in the oil chamber so as to urge it upwardly, said coil spring being housed inside the oil chamber 40. This spring 47 is less resilient than the spring 37. However, when said spring 47 is fully compressed, the rod 36a as it continues moving downwardly compresses in its turn the spring 37 and actuates the switch 46. The latter as shown in Fig. 5 breaks the circuit of the relay 23 whereby the contactpiece 29 is shifted and reverses the direction of movement of the tubular member 14. The latter begins rising under the action of the spring 47 so that the switch 46 closes again, which initiates a further downward movement of the tubular member 14. Said reciprocation of the latter is repeated during the boring as will be readily understood.

Lastly, the machine is provided with a hand operable switch 48 also illustrated diagrammatically in Fig. 5 and with a switch 49 (Figs. 2 and 5) which is controlled by a stop 50 rigid with the tubular member 14 so as to. produce a stoppage of the machine as soon as the quill has entered its lowermost allowed position.

What we claim is:

1. In a boring machine comprising a frame, a table moving freely in a horizontal plane with reference to the frame and adapted to carry a template provided with a centering recess and a work, the combination of a vertical quill shiftably carried by the frame to move vertically with reference to a point of the table withln the location of the work, a boring spindle revolubly mounted in said quill, a fluid-operated system including a pilot cylinder, a piston in said cylinder and a piston rod on the piston, a lever, three pivotal connections of which two include an intermediate arm, pivotally connecting the lever with a point of the frame, with the quill and with the piston rod respectively, the piston rod controlling through the lever the vertical movement of the quill with reference to the work, a feeler rod shiftably carried by the frame above a point of the table within the location of the template for engagement with the recess in the template upon a shifting of the table bringing said recess into accurate vertical register With the feeler rod, a hand operable control lever pivotally connected with the feeler rod and controlling the vertical position of the latter, and electric means through which the operative movement of the control lever produces operation of the fluid-operated system and therethrough a downward shifting of the quill and of the boring spindle therein.

2 In a boring machine comprising a frame, a table moving freely in a horizontal plane with reference to the frame and adapted to carry a template provided with a centering recess and a work, the combination of a vertical quill shiftably carried by the frame to move vertically with reference to a point of the table within the location of the work, a boring spindle revolubly mounted in said quill, a fluid-operated system including a pilot cylinder, a piston in said cylinder and a piston rod on the piston, a lever, three pivotal connections of which two include an intermediate arm, pivotally connecting the lever with a point of the frame, with the quill and with the piston rod respectively, the piston rod controlling through the lever the vertical movement of the quill with reference to the work, the pivotal connection with the frame being located outside the two other pivotal connections and the relative amplitude of movement of the piston rod and of the quill being defined by the ratio between the distances of the pivotal connection with the frame and the two other pivotal connections respectively, means for shifting adjustably the location of the point of the frame pivotally connected with the lever to define the maximum depth of the opening to be bored in the work by the machine spindle, a feeler rod shiftably carried by the frame above a point of the table within the location of the template for engagement with the recess in the template upon a shifting of the table bringing said recess into accurate vertical register with the feeler rod, a hand operable control lever pivotally connected with the feeler rod and controlling the vertical position of the latter, and electric means through which the operative movement of the control lever produces operation of the fluid-operated system and therethrough a downward shifting of the quill and of the boring spindle therein.

3. In a boring machine comprising a frame, a table moving freely in a horizontal plane with reference to the frame and adapted to carry a template provided with a centering recess and a work, the combination of a vertical quill shiftably carried by the frame to move vertically with reference to a point of the table within the location of the work, a boring spindle revolubly mounted in said quill, a fluid-operated system including a pilot cylinder, a piston in said cylinder and a piston rod on the piston, a lever, three pivotal connections of which two include an intermediate arm, pivotally connecting the lever with a point of the frame, with the quill and with the piston rod respectively, the piston rod controlling through the lever the vertical movement of the quill with reference to the work, a feeler rod shiftably carried by the frame above a point of the table within the location of the template for engagement with the recess in the template upon a shifting of the table bringing said recess into accurate vertical register with the feeler rod, a hand operable control lever pivotally connected with the feeler rod and controlling the vertical position of the latter, an auxiliary member pivotally secured to the control lever and controlled thereby in unison with the feeler member, elastic means urging said auxiliary member and control member into the position corresponding to an inoperative raised position of the feeler rod, a switch controlled by the auxiliary member when urged by the control lever into a position corresponding to the operative depressed position of the feeler rod, a circuit controlled by said switch, valves adapted to control the distribution of fluid into the hydraulic system, a relay controlled by the switch-controlled circuit to operate the valves in the fluid-operated system to make the piston produce, through said mechanical means, a downward shifting of the quill and of the boring spindle therein.

4. In a boring machine comprising a frame, a table moving freely in a horizontal plane with reference to the frame and adapted to carry a template provided with a centering recess and a work, the combination of a vertical quill shiftably carried by the frame to move vertically with reference to a point of the table within the location of the work, a boring spindle revolubly mounted in said quill, a fluid-operated system including a pilot cylinder, a piston in said cylinder, and a piston rod on the piston, mechanical means through which said piston rod controls the vertical movements of the quill, a socket slidably fitted over one end of the piston rod, a spring inserted between the bottom of the socket and the end of the piston rod, an oil-filled chamber inside which said socket is adapted to slide fluidtightly, an auxiliary chamber communicating with the first mentioned chamber, means for adjusting the cross-sectional area of the connection between the two chambers, the two chambers forming to- I gether with the socket a damping system adapted to slow down the progression of the spindle carried by the quill during the boring operation, a feeler rod shiftably carried by the frame above a point of the table within the location of the template for engagement with the recess in the template upon a shifting of the table bringing said recess into accurate vertical register with the feeler rod, a hand operable control lever pivotally connected with the feeler rod and controlling the vertical position of the latter, an auxiliary memberpivotally secured to the control lever and controlled thereby in unison with the feeler member, elastic means urging said auxiliary member and control member into the position corresponding to an inoperative raised position of the feeler rod, a switch controlled by the auxiliary member when urged 5 by the control lever into a position corresponding to the operative depressed position of the feeler rod, a circuit controlled by said switch, valves adapted to control the distribution of fluid into the fluid-operated system, a relay controlled by the switch-controlled circuit to operate the valves in the fluid-operated system to make the piston produce, through said mechanical means, a downward shifting of the quill and of the boring spindle there in, an auxiliary switch carried by the socket and controlling the electric circuit to be actuated, upon sufii- 10 cient progression ofthe socket under the action of the piston rod against the spring cooperating with the socket, to deenergize the relay and allow a transient return movement of the piston rod and quill, the switch being closed again through this return movement to allow operation of the relay to be resumed and so on repeatedly.

References Cited in the file of this patent UNITED STATES PATENTS 447,014 Prybil Feb. 24, 1891 1,069,995 Anderson Aug. 12, 1913 2,389,653 Turchan et a1. Nov. 27, 1945 2,488,992 Taylor Nov. 22, 1949 FOREIGN PATENTS 281,777 Great Britain Dec. 12, 1927 

